The application of PD (partial discharge) measurements to solid insulation within electronic components and assemblies in the low voltage range (e.g. optocouplers, small transformers, and printed wiring boards with coating) for the verification of insulation integrity, is reported. Such measurements are of special interest if such insulation is used to reduce electrical separation. In order to simulate the aging process during the normal life of equipment, different aging procedures were applied. The results of PD measurements after aging are compared with the data obtained before.
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